Led by the voice of the Mara inside Aris, the Kinda begin their attack on the dome. The Doctor, Todd, and an awakened Tegan attempt to stop the two sides destroying each other and hatch a plan to defeat the snake-like Mara.
With a frightening vision of what's to come from Panna (the Kinda's blind visionary), the Doctor must break Hindle's control over the Kinda hostages and stop his deforestation plan, then send the Mara back to The Dark Places of the Inside from whence it came before it can destroy the Kinda and head out to topple civilizations.—statmanjeff